[Health As Determined by Planetary Aspects] - Pro Crisibus Morborum et Aspectibus Planetarum |
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Description
This is a very unusual, baroque style astrological chart. The chart illustrates good and bad periods of health or physical vulnerability in relation to the planetary alignments. It also illustrates the ancient Greek astrological concept of the climacteric years (annus climactericus). This seven year cycle was thought to be critical in a person's life. The tables on either side of the chart have columns of numbers corresponding to Motus Menstruus [the lunar cycle] and Motus Diurnus [daily motion of stars around the Earth].
Johann Zahn (29 March 1641, Karlstadt am Main – 27 June 1707) was the seventeenth-century German author of Oculus Artificialis Teledioptricus Sive Telescopium (Würzburg, 1685). This work contains many descriptions and diagrams, illustrations and sketches of both the camera obscura and magic lantern, along with various other lanterns, slides, projection types, peepshow boxes, microscopes, telescopes, reflectors, and lenses. As a student of light, Zahn is considered the most prolific writer and illustrator of the camera obscura.
The first camera that was small and portable enough to be practical for photography (that is, actually capturing the image on some sort of medium) was envisioned by Zahn in 1685, though it would be almost 150 years before technology caught up to the point where this was possible to actually build
He also illustrated a large workshop camera obscura for solar observations using the telescope and scioptric ball. Zahn also includes an illustration of a camera obscura in the shape of a goblet, based on a design described (but not illustrated) by Pierre Hérigone. Zahn also designed several portable camera obscuras, and made one that was 23 inches long. He demonstrated the use of mirrors and lenses to erect the image, enlarge and focus it.
Zahn is also the author of the compendium of mathematics and natural history, titled Specula Physico-Mathematico-Historica Notabilium ac Mirabilium Scienciorum (1696).
Reference: https://www.christies.com/en/lot/lot-6069704 https://books.google.it/books?id=vxRTAAAAcAAJ&printsec=frontcover&source=gbs_book_other_versions_r&redir_esc=y#v=onepage&q&f=false
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